On the NATS TLPD red is generated from radar derived information from a UK source, pink is derived from other radar sources and as such they are pretty reliable. Orange(?), I think you mean gold, are aircraft subject to flow restrictions and not yet airbourne and they tend to be fairly accurate as well. Green you have right, pending live with no flow restriction and these tend to be very changable. The UK TLPD is an accurate reflection of the information that is entered into it. The quality of that information though..............
